The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2008
Filed:
Mar. 02, 2004
Youngjune Lee Gwon, Mountain View, CA (US);
Ravi Kumar Jain, Palo Alto, CA (US);
Toshiro Kawahara, Saratoga, CA (US);
Youngjune Lee Gwon, Mountain View, CA (US);
Ravi Kumar Jain, Palo Alto, CA (US);
Toshiro Kawahara, Saratoga, CA (US);
NTT DoCoMo Inc., Tokyo, JP;
Abstract
A method for location estimation employs filtering in both the radio signal domain and the space domain separately. The method filters raw values of the run-time radio signal measurements to reject distorted inputs. A region of confidence (RoC) is formed according to certain algorithms. Only location estimates falling within the RoC are considered for further processing. The location estimate candidates filtered by the RoC are put in a number of time-indexed bins. Each of the bins contains location estimate candidates obtained at similar times. A shortest route connecting a candidate from each bin is calculated to further improve the accuracy of the location estimation.